Coaxial gas flow silencer for a firearm

Abstract

A coaxial gas flow silencer for a firearm having an outer sleeve or cylinder forming an outer surface of the silencer and an inner sleeve or cylinder forming an inner surface of the silencer. Within the inner cylinder is a core portion having a bore through which a projectile will travel, and one or more expansion chambers for expanding exhaust gas from the firing of a cartridge. The space between the inner an outer cylinders forms a first passage for a first portion of exhaust gas, exiting the silencer through a number of radially arranged openings at a periphery of an end plate at the muzzle end of the silencer. The inner cylinder and core portion form a second passage for a second portion of exhaust gas exiting via the bore through a central opening in the face plate.

The invention claimed is: 
     
       1. A silencer for a firearm comprising a barrel attachment part at a proximal end of the silencer for connecting the silencer to a barrel of the firearm and a muzzle part at a distal end of the silencer, the silencer further comprising an outer sleeve portion forming a part of an outer surface of the silencer, and an inner sleeve portion having a core portion located within the inner sleeve portion, wherein a space between the core portion and the inner sleeve portion defines at least one expansion cavity for expanding exhaust gas from the firing of a cartridge, said core portion comprising a throughgoing bore arranged to receive and convey a projectile of the cartridge through and exiting the silencer, and at least one opening connecting the bore with the at least one expansion cavity, wherein, when the silencer is assembled, a space between said outer sleeve portion and inner sleeve portion forms a first volume defining a first passage for arranged to expel a first portion of exhaust gases from the muzzle part though a plurality of radial openings in an end plate of the muzzle part, the radial openings being in communication with the first passage, and wherein said inner sleeve portion and core portion with bore form a second volume defining a second passage arranged to expel a second portion of exhaust gases from the muzzle part via the bore through a central opening in the end plate. 
     
     
       2. A silencer according to  claim 1 , comprising at least one intermediate module element arranged between the barrel attachment part and the muzzle part, the at least one intermediate module element comprising a corresponding outer sleeve portion, inner sleeve portion, expansion cavity and core portion with bore, and wherein a radial connection part connects the inner sleeve portion to the outer sleeve portion, the radial connection part having at least one axial throughgoing opening arranged to permit the first portion of exhaust gases to traverse the radial connection part along the first passage. 
     
     
       3. A silencer according to  claim 2 ,
 wherein each of the barrel attachment part, the muzzle part, and the at least one intermediate module element are provided with a threaded portion for interconnection therebetween, and wherein outer surfaces of the barrel attachment part, the muzzle part and the at least one intermediate module element together comprise the outer sleeve portion of the silencer. 
 
     
     
       4. A silencer according to  claim 2 ,
 wherein the inner sleeve portion and the outer sleeve portion of the intermediate module element extend outward in one direction from the radial connection part, and the core portion extends outward in an opposite direction from the radial connection part. 
 
     
     
       5. A silencer according to one of  claims 1-4 ,
 wherein the barrel attachment part is in fluid communication with both the first and second passages. 
 
     
     
       6. A silencer according to  claim 2 , wherein the at least one axial throughgoing opening of the radial connection part is angled over a material of the radial connection part. 
     
     
       7. A silencer according to  claim 6 ,
 wherein the at least one radial throughgoing opening is arranged at an angle with the throughgoing bore. 
 
     
     
       8. A silencer according to  claim 1 or 2 ,
 wherein a diameter of the inner sleeve is larger than a diameter of the core portion. 
 
     
     
       9. A silencer according to  claim 1 ,
 wherein an outer sleeve portion of the barrel attachment part has a tapered form. 
 
     
     
       10. A silencer according to  claim 1 ,
 wherein the the barrel attachment part comprises a radial connection part between an outer sleeve portion and an inner sleeve portion, the radial connection part having at least one axial through going opening in communication with the first passage, for transmittal of at least a part of the first portion of exhaust gases from the barrel attachment part to the first passage. 
 
     
     
       11. A silencer according to  claim 1 ,
 wherein the plurality of radial openings of the end plate have a circular, oval, polygonal or square shape. 
 
     
     
       12. A silencer according to  claim 1 or 2 , wherein wherein the silencer is arranged to direct a third portion of exhaust gas to cycle the firing of the firearm.